Silver 3 Inch Ruler Bookmark. This ruler has been on display at exhibitions and shows signs of fine scratches on the front and on the back. This silver bookmark serves 2 purposes, as a bookmark and as a little ruler. The Silver Ruler Bookmark measures 4″ (10.1cm) in total and has ruler lines up to 8cm along one edge and up to 3″ along the other edge. The standard Ruler bookmark is 1mm in thickness. This ruler bookmark still makes a lovely gift. Made in the UK by our silversmith and fully hallmarked. Can be engraved on the back. Presented in a gift box.